Follow-up test for complement activity screening when CH50 and AH50 are low or absent and high suspicion remains for complement deficiency.
Quantitative Radial Immunodiffusion
Serum separator tube.
Allow specimen to clot for one hour at room temperature. Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube and freeze immediately. (Min: 0.3 mL)
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Non-frozen specimens. Specimens exposed to repeated freeze/thaw cycles. Specimens left to clot at refrigerated temperature.
After separation from cells: Ambient: 2 hours; Refrigerated: Unacceptable; Frozen: 2 weeks
|Component Test Code*||Component Chart Name||LOINC|
|0050156||Complement Component 5||4505-4|
- C5 Antigen
- C5 Level
- complement terminal pathway
- Fifth component of complement
- Terminal Pathway - Complement